当键名不同时休眠一对一关联

Question

我有两个具有一对一关系的复合 id 表。

表一：PK 列：column1，column2 表二：PK列：column3，column4。

列具有不同的名称。我必须将 column1 映射到 column3 并将 column2 映射到 column4。 Table1（父表）声明：

<class name="com.java.TABLE1" table="TABLE1">
        <composite-id name="TABLE1_pk" class="com.tc4.dal.TABLE1_PK">
            <key-property name="COLUMN1" column="COLUMN1" />
            <key-property name="COLUMN2" column="COLUMN3" />
        </composite-id>
...remaining properties declarations...

<one-to-one name="TABLE2" class="com.tc4.dal.TABLE2"
            cascade="save-update, delete">
             <key column="COLUMN3" property-ref="COLUMN1" />
            <key column="COLUMN4" property-ref="COLUMN2" />
</one-to-one> 
</class>

Table2（子表）映射

<class name="com.java.TABLE2" table="TABLE2">
        <composite-id name="TABLE2_pk" class="com.tc4.dal.TABLE2_PK">
            <key-property name="COLUMN3" column="COLUMN3" />
            <key-property name="COLUMN4" column="COLUMN4" />
        </composite-id>
</class>

在启动应用程序时，出现以下异常

  Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from resource com/JAVA/TABLE1.hbm.xml
    Caused by: org.xml.sax.SAXParseException: The content of element type "one-to-one" must match "(meta*,formula*)".
    at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:196)
    at org.apache.xerces.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:132)
    at org.apache.xerces.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:390)

如何在这种情况下在映射文件中给予一对一的关联。

问候， 纳雷什。

Answer 1

重命名子表复合键列，因为它们在父表中已经解决了这个问题。 详细说明：- - 父表（TABLE1）：

<class name="com.java.TABLE1" table="TABLE1">
            <composite-id name="TABLE1_pk" class="com.tc4.dal.TABLE1_PK">
                <key-property name="COLUMN1Prop" column="COLUMN1" />
                <key-property name="COLUMN2Prop" column="COLUMN3" />
    </composite-id>
    .... remaining properties
    </class>

//由于TABLE1有composit key，需要为TABLE1创建主键POJO

public class TABLE1_PK {
    public String COLUMN1Prop;
    public String COLUMN2Prop;
  }

TABLE1 实体：

public class TABLE1{
  // declare PK
  private TABLE1_PK TABLE1_pk;
// getters and setters and remaining properties
}

• 子表（TABLE2）：

   <class name="com.java.TABLE2" table="TABLE2">
                       <composite-id name="TABLE2_pk" class="com.tc4.dal.TABLE2_PK">
                           <key-property name="COLUMN1Prop" column="COLUMN3" />
                           <key-property name="COLUMN2Prop" column="COLUMN4" />
               </composite-id>
               .... remaining properties
        </class>
  

子实体PK

public class TABLE2_PK{
// here property names should be defined as parent Entity properties
        public String COLUMN1Prop;
        public String COLUMN2Prop;
.. getters and setters
}

Answer 2

带有注释你可以像这样实现它..在表1中

 @OneToOne(targetEntity = TABLE2.class, fetch = FetchType.LAZY)
   @JoinColumns(value = {
         @JoinColumn(name = "COLUMN1", referencedColumnName = "COLUMN3"),
         @JoinColumn(name = "COLUMN2", referencedColumnName = "COLUMN4") })
  TABLE2 table2

使用 XML 试试这个并告诉我

<class name="com.java.TABLE1" table="TABLE1">
        <composite-id name="TABLE1_pk" class="com.tc4.dal.TABLE1_PK">
            <key-property name="COLUMN1PROP" column="COLUMN1" />
            <key-property name="COLUMN2PROP" column="COLUMN3" />
        </composite-id>
...remaining properties declarations...

<one-to-one name="TABLE2" class="com.tc4.dal.TABLE2"
            cascade="save-update, delete">
             <key column="COLUMN1PROP" property-ref="COLUMN3PROP" />
            <key column="COLUMN2PROP" property-ref="COLUMN4PROP" />
</one-to-one> 
</class>

<class name="com.java.TABLE2" table="TABLE2">
        <composite-id name="TABLE2_pk" class="com.tc4.dal.TABLE2_PK">
            <key-property name="COLUMN3PROP" column="COLUMN3" />
            <key-property name="COLUMN4PROP" column="COLUMN4" />
        </composite-id>
</class>

或者

<class name="com.java.TABLE1" table="TABLE1">
        <composite-id name="TABLE1_pk" class="com.tc4.dal.TABLE1_PK">
            <key-property name="COLUMN1PROP" column="COLUMN1" />
            <key-property name="COLUMN2PROP" column="COLUMN3" />
        </composite-id>
...remaining properties declarations...

<one-to-one name="TABLE2" class="com.tc4.dal.TABLE2"
            cascade="save-update, delete">
             <key column="COLUMN1" property-ref="COLUMN3PROP" />
            <key column="COLUMN2" property-ref="COLUMN4PROP" />
</one-to-one> 
</class>

<class name="com.java.TABLE2" table="TABLE2">
        <composite-id name="TABLE2_pk" class="com.tc4.dal.TABLE2_PK">
            <key-property name="COLUMN3PROP" column="COLUMN3" />
            <key-property name="COLUMN4PROP" column="COLUMN4" />
        </composite-id>
</class>

让我知道哪一个有效。 :)